Abstract: The solar wind speed structure on the source surface is studied on the basis of IPS data in the year of l984 during Carrington rotation l745- l755' IN the mapping-back processes, the influence of acceleration on the foot point of the Archimedian spiral and the values of solar wind speed are considered. The results is compared with the map determined by the MHD model which uses the K-coronal brightness and photospheric magnetic field as inputing condition. This results are also compared with that from the other authors. The comparison shows that: the MHD model can preliminarily work out the 2-D structure of solar wind; and the decrescent amplitude and width of the low-speed belt seems to imply the ekistence of a latitudinal direction stream.